.blink {
    -webkit-animation-duration: 1s;
    animation-duration: 1s;
    -webkit-animation-name: blink;
    animation-name: blink;
    -webkit-animation-iteration-count: infinite;
    animation-iteration-count: infinite;
    -webkit-animation-direction: alternate;
    animation-direction: alternate;
    -webkit-animation-timing-function: ease-in-out;
    animation-timing-function: ease-in-out;
}
@-webkit-keyframes blink {
    from {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}
@keyframes blink {
    from {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}